The elevator has three tabs, the control tab that "flies" the elevator. A geared tab that assists the control tab and an antifloat tab that aids in forward MAC landing configs.

 

Except in the 777's case its the hydraulic system that moves the elevators  not the tabs. Take a look whenever a 777 is doing its flight control checks, you will see the elevator move to its full up and down limits unlike an MD-80 where the tabs will move but the elevator won't if there is no wind. 

Think we officially ran out of questions  :rolleyes:

 

Definitely! Ha - I think we ran out last year..

Except in the 777's case its the hydraulic system that moves the elevators not the tabs. Take a look whenever a 777 is doing its flight control checks, you will see the elevator move to its full up and down limits unlike an MD-80 where the tabs will move but the elevator won't if there is no wind.

Yes, the 777's elevators are hydraulic. The MD80 and the 777 stabilizers are moved by electric motors and change with pitch trim input.

 

 

The MD80 and the 777 stabilizers are moved by electric motors and change with pitch trim input.

 

You seem to be the person to ask this question (and I apologize for the derail of the topic).

 

Riddle me this:

When I worked ramp at IAD, I'd always see NWA's busted DC-9s taxiing by for departure, and it always seemed like one elevator/tab/etc wasn't at the same level as the other.  What's that all about?

 

Here's an example I found online:

The elevators themselves are completely independent and free flying. The only connections are the torque bar that connects the left and right control columns. Other than that all tabs are linked to movement from only their independent elevator. Hydraulic power will push both elevators to full nose down in certain high AOA conditions. The only time on the ground when both elevators move in unison is when this system is tested.

 

Cheers.

Interesting...

 

Thanks!

Hi to all,

 

as the 777 is a fly by wire designed aircraft it has no "tabs" on the elevator anymore! You're not able to fly this a/c without

hydraulic power supply like a 737 wich has a manual reversion. The flight controls are only via PCU's actuated.

 

Greetings,

 

Sven Wendel

I'm not even sure that's true, but cmon - the 400X is an ancient product now (6+ years ago) compared to our current level of modelling. The 777 model absolutely does everything the real airplane does as far as surface motion etc.

 

well, I know that it was not modeled, because of this thread:

 

http://forum.avsim.net/topic/122517-747x-elevator-trim-adjustment-not-evident-visually/

Ok, that's why then - we're doing things differently now and it works. (will with the 744v2 as well of course)

yippee!  I'm happy to hear that.  it's just another bit of detail that adds to the fun.  thank you.